osfmk/kern/processor.c

   1 /*
   2  * Copyright (c) 2000-2009 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * @OSF_COPYRIGHT@
  30  */
  31 /*
  32  * Mach Operating System
  33  * Copyright (c) 1991,1990,1989,1988 Carnegie Mellon University
  34  * All Rights Reserved.
  35  *
  36  * Permission to use, copy, modify and distribute this software and its
  37  * documentation is hereby granted, provided that both the copyright
  38  * notice and this permission notice appear in all copies of the
  39  * software, derivative works or modified versions, and any portions
  40  * thereof, and that both notices appear in supporting documentation.
  41  *
  42  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  43  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  44  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  45  *
  46  * Carnegie Mellon requests users of this software to return to
  47  *
  48  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  49  *  School of Computer Science
  50  *  Carnegie Mellon University
  51  *  Pittsburgh PA 15213-3890
  52  *
  53  * any improvements or extensions that they make and grant Carnegie Mellon
  54  * the rights to redistribute these changes.
  55  */
  56 /*
  57  */
  58
  59 /*
  60  *      processor.c: processor and processor_set manipulation routines.
  61  */
  62
  63 #include <mach/boolean.h>
  64 #include <mach/policy.h>
  65 #include <mach/processor.h>
  66 #include <mach/processor_info.h>
  67 #include <mach/vm_param.h>
  68 #include <kern/cpu_number.h>
  69 #include <kern/host.h>
  70 #include <kern/machine.h>
  71 #include <kern/misc_protos.h>
  72 #include <kern/processor.h>
  73 #include <kern/sched.h>
  74 #include <kern/task.h>
  75 #include <kern/thread.h>
  76 #include <kern/ipc_host.h>
  77 #include <kern/ipc_tt.h>
  78 #include <ipc/ipc_port.h>
  79 #include <kern/kalloc.h>
  80
  81 /*
  82  * Exported interface
  83  */
  84 #include <mach/mach_host_server.h>
  85 #include <mach/processor_set_server.h>
  86
  87 struct processor_set    pset0;
  88 struct pset_node                pset_node0;
  89 decl_simple_lock_data(static,pset_node_lock)
  90
  91 queue_head_t                    tasks;
  92 queue_head_t                    terminated_tasks;       /* To be used ONLY for stackshot. */
  93 int                                             tasks_count;
  94 int                                             terminated_tasks_count;
  95 queue_head_t                    threads;
  96 int                                             threads_count;
  97 decl_lck_mtx_data(,tasks_threads_lock)
  98
  99 processor_t                             processor_list;
 100 unsigned int                    processor_count;
 101 static processor_t              processor_list_tail;
 102 decl_simple_lock_data(,processor_list_lock)
 103
 104 uint32_t                                processor_avail_count;
 105
 106 processor_t             master_processor;
 107 int                     master_cpu = 0;
 108 boolean_t               sched_stats_active = FALSE;
 109
 110 /* Forwards */
 111 kern_return_t   processor_set_things(
 112                 processor_set_t         pset,
 113                 mach_port_t             **thing_list,
 114                 mach_msg_type_number_t  *count,
 115                 int                     type);
 116
 117 void
 118 processor_bootstrap(void)
 119 {
 120         pset_init(&pset0, &pset_node0);
 121         pset_node0.psets = &pset0;
 122
 123         simple_lock_init(&pset_node_lock, 0);
 124
 125         queue_init(&tasks);
 126         queue_init(&terminated_tasks);
 127         queue_init(&threads);
 128
 129         simple_lock_init(&processor_list_lock, 0);
 130
 131         master_processor = cpu_to_processor(master_cpu);
 132
 133         processor_init(master_processor, master_cpu, &pset0);
 134 }
 135
 136 /*
 137  *      Initialize the given processor for the cpu
 138  *      indicated by cpu_id, and assign to the
 139  *      specified processor set.
 140  */
 141 void
 142 processor_init(
 143         processor_t                     processor,
 144         int                                     cpu_id,
 145         processor_set_t         pset)
 146 {
 147         spl_t           s;
 148
 149         if (processor != master_processor) {
 150                 /* Scheduler state deferred until sched_init() */
 151                 SCHED(processor_init)(processor);
 152         }
 153
 154         processor->state = PROCESSOR_OFF_LINE;
 155         processor->active_thread = processor->next_thread = processor->idle_thread = THREAD_NULL;
 156         processor->processor_set = pset;
 157         processor->current_pri = MINPRI;
 158         processor->current_thmode = TH_MODE_NONE;
 159         processor->cpu_id = cpu_id;
 160         timer_call_setup(&processor->quantum_timer, thread_quantum_expire, processor);
 161         processor->deadline = UINT64_MAX;
 162         processor->timeslice = 0;
 163         processor->processor_meta = PROCESSOR_META_NULL;
 164         processor->processor_self = IP_NULL;
 165         processor_data_init(processor);
 166         processor->processor_list = NULL;
 167
 168         s = splsched();
 169         pset_lock(pset);
 170         if (pset->cpu_set_count++ == 0)
 171                 pset->cpu_set_low = pset->cpu_set_hi = cpu_id;
 172         else {
 173                 pset->cpu_set_low = (cpu_id < pset->cpu_set_low)? cpu_id: pset->cpu_set_low;
 174                 pset->cpu_set_hi = (cpu_id > pset->cpu_set_hi)? cpu_id: pset->cpu_set_hi;
 175         }
 176         pset_unlock(pset);
 177         splx(s);
 178
 179         simple_lock(&processor_list_lock);
 180         if (processor_list == NULL)
 181                 processor_list = processor;
 182         else
 183                 processor_list_tail->processor_list = processor;
 184         processor_list_tail = processor;
 185         processor_count++;
 186         simple_unlock(&processor_list_lock);
 187 }
 188
 189 void
 190 processor_meta_init(
 191         processor_t             processor,
 192         processor_t             primary)
 193 {
 194         processor_meta_t        pmeta = primary->processor_meta;
 195
 196         if (pmeta == PROCESSOR_META_NULL) {
 197                 pmeta = kalloc(sizeof (*pmeta));
 198
 199                 queue_init(&pmeta->idle_queue);
 200
 201                 pmeta->primary = primary;
 202         }
 203
 204         processor->processor_meta = pmeta;
 205 }
 206
 207 processor_set_t
 208 processor_pset(
 209         processor_t     processor)
 210 {
 211         return (processor->processor_set);
 212 }
 213
 214 pset_node_t
 215 pset_node_root(void)
 216 {
 217         return &pset_node0;
 218 }
 219
 220 processor_set_t
 221 pset_create(
 222         pset_node_t                     node)
 223 {
 224         processor_set_t         *prev, pset = kalloc(sizeof (*pset));
 225
 226         if (pset != PROCESSOR_SET_NULL) {
 227                 pset_init(pset, node);
 228
 229                 simple_lock(&pset_node_lock);
 230
 231                 prev = &node->psets;
 232                 while (*prev != PROCESSOR_SET_NULL)
 233                         prev = &(*prev)->pset_list;
 234
 235                 *prev = pset;
 236
 237                 simple_unlock(&pset_node_lock);
 238         }
 239
 240         return (pset);
 241 }
 242
 243 /*
 244  *      Initialize the given processor_set structure.
 245  */
 246 void
 247 pset_init(
 248         processor_set_t         pset,
 249         pset_node_t                     node)
 250 {
 251         if (pset != &pset0) {
 252                 /* Scheduler state deferred until sched_init() */
 253                 SCHED(pset_init)(pset);
 254         }
 255
 256         queue_init(&pset->active_queue);
 257         queue_init(&pset->idle_queue);
 258         pset->online_processor_count = 0;
 259         pset_pri_init_hint(pset, PROCESSOR_NULL);
 260         pset_count_init_hint(pset, PROCESSOR_NULL);
 261         pset->cpu_set_low = pset->cpu_set_hi = 0;
 262         pset->cpu_set_count = 0;
 263         pset->pending_AST_cpu_mask = 0;
 264         pset_lock_init(pset);
 265         pset->pset_self = IP_NULL;
 266         pset->pset_name_self = IP_NULL;
 267         pset->pset_list = PROCESSOR_SET_NULL;
 268         pset->node = node;
 269 }
 270
 271 kern_return_t
 272 processor_info_count(
 273         processor_flavor_t              flavor,
 274         mach_msg_type_number_t  *count)
 275 {
 276         switch (flavor) {
 277
 278         case PROCESSOR_BASIC_INFO:
 279                 *count = PROCESSOR_BASIC_INFO_COUNT;
 280                 break;
 281
 282         case PROCESSOR_CPU_LOAD_INFO:
 283                 *count = PROCESSOR_CPU_LOAD_INFO_COUNT;
 284                 break;
 285
 286         default:
 287                 return (cpu_info_count(flavor, count));
 288         }
 289
 290         return (KERN_SUCCESS);
 291 }
 292
 293
 294 kern_return_t
 295 processor_info(
 296         register processor_t    processor,
 297         processor_flavor_t              flavor,
 298         host_t                                  *host,
 299         processor_info_t                info,
 300         mach_msg_type_number_t  *count)
 301 {
 302         register int    cpu_id, state;
 303         kern_return_t   result;
 304
 305         if (processor == PROCESSOR_NULL)
 306                 return (KERN_INVALID_ARGUMENT);
 307
 308         cpu_id = processor->cpu_id;
 309
 310         switch (flavor) {
 311
 312         case PROCESSOR_BASIC_INFO:
 313         {
 314                 register processor_basic_info_t         basic_info;
 315
 316                 if (*count < PROCESSOR_BASIC_INFO_COUNT)
 317                         return (KERN_FAILURE);
 318
 319                 basic_info = (processor_basic_info_t) info;
 320                 basic_info->cpu_type = slot_type(cpu_id);
 321                 basic_info->cpu_subtype = slot_subtype(cpu_id);
 322                 state = processor->state;
 323                 if (state == PROCESSOR_OFF_LINE)
 324                         basic_info->running = FALSE;
 325                 else
 326                         basic_info->running = TRUE;
 327                 basic_info->slot_num = cpu_id;
 328                 if (processor == master_processor)
 329                         basic_info->is_master = TRUE;
 330                 else
 331                         basic_info->is_master = FALSE;
 332
 333                 *count = PROCESSOR_BASIC_INFO_COUNT;
 334                 *host = &realhost;
 335
 336             return (KERN_SUCCESS);
 337         }
 338
 339         case PROCESSOR_CPU_LOAD_INFO:
 340         {
 341                 processor_cpu_load_info_t       cpu_load_info;
 342                 timer_t         idle_state;
 343                 uint64_t        idle_time_snapshot1, idle_time_snapshot2;
 344                 uint64_t        idle_time_tstamp1, idle_time_tstamp2;
 345
 346                 /*
 347                  * We capture the accumulated idle time twice over
 348                  * the course of this function, as well as the timestamps
 349                  * when each were last updated. Since these are
 350                  * all done using non-atomic racy mechanisms, the
 351                  * most we can infer is whether values are stable.
 352                  * timer_grab() is the only function that can be
 353                  * used reliably on another processor's per-processor
 354                  * data.
 355                  */
 356
 357                 if (*count < PROCESSOR_CPU_LOAD_INFO_COUNT)
 358                         return (KERN_FAILURE);
 359
 360                 cpu_load_info = (processor_cpu_load_info_t) info;
 361                 if (precise_user_kernel_time) {
 362                         cpu_load_info->cpu_ticks[CPU_STATE_USER] =
 363                                                         (uint32_t)(timer_grab(&PROCESSOR_DATA(processor, user_state)) / hz_tick_interval);
 364                         cpu_load_info->cpu_ticks[CPU_STATE_SYSTEM] =
 365                                                         (uint32_t)(timer_grab(&PROCESSOR_DATA(processor, system_state)) / hz_tick_interval);
 366                 } else {
 367                         uint64_t tval = timer_grab(&PROCESSOR_DATA(processor, user_state)) +
 368                                 timer_grab(&PROCESSOR_DATA(processor, system_state));
 369
 370                         cpu_load_info->cpu_ticks[CPU_STATE_USER] = (uint32_t)(tval / hz_tick_interval);
 371                         cpu_load_info->cpu_ticks[CPU_STATE_SYSTEM] = 0;
 372                 }
 373
 374                 idle_state = &PROCESSOR_DATA(processor, idle_state);
 375                 idle_time_snapshot1 = timer_grab(idle_state);
 376                 idle_time_tstamp1 = idle_state->tstamp;
 377
 378                 /*
 379                  * Idle processors are not continually updating their
 380                  * per-processor idle timer, so it may be extremely
 381                  * out of date, resulting in an over-representation
 382                  * of non-idle time between two measurement
 383                  * intervals by e.g. top(1). If we are non-idle, or
 384                  * have evidence that the timer is being updated
 385                  * concurrently, we consider its value up-to-date.
 386                  */
 387                 if (PROCESSOR_DATA(processor, current_state) != idle_state) {
 388                         cpu_load_info->cpu_ticks[CPU_STATE_IDLE] =
 389                                                         (uint32_t)(idle_time_snapshot1 / hz_tick_interval);
 390                 } else if ((idle_time_snapshot1 != (idle_time_snapshot2 = timer_grab(idle_state))) ||
 391                                    (idle_time_tstamp1 != (idle_time_tstamp2 = idle_state->tstamp))){
 392                         /* Idle timer is being updated concurrently, second stamp is good enough */
 393                         cpu_load_info->cpu_ticks[CPU_STATE_IDLE] =
 394                                                         (uint32_t)(idle_time_snapshot2 / hz_tick_interval);
 395                 } else {
 396                         /*
 397                          * Idle timer may be very stale. Fortunately we have established
 398                          * that idle_time_snapshot1 and idle_time_tstamp1 are unchanging
 399                          */
 400                         idle_time_snapshot1 += mach_absolute_time() - idle_time_tstamp1;
 401
 402                         cpu_load_info->cpu_ticks[CPU_STATE_IDLE] =
 403                                 (uint32_t)(idle_time_snapshot1 / hz_tick_interval);
 404                 }
 405
 406                 cpu_load_info->cpu_ticks[CPU_STATE_NICE] = 0;
 407
 408             *count = PROCESSOR_CPU_LOAD_INFO_COUNT;
 409             *host = &realhost;
 410
 411             return (KERN_SUCCESS);
 412         }
 413
 414         default:
 415             result = cpu_info(flavor, cpu_id, info, count);
 416             if (result == KERN_SUCCESS)
 417                         *host = &realhost;
 418
 419             return (result);
 420         }
 421 }
 422
 423 kern_return_t
 424 processor_start(
 425         processor_t                     processor)
 426 {
 427         processor_set_t         pset;
 428         thread_t                        thread;
 429         kern_return_t           result;
 430         spl_t                           s;
 431
 432         if (processor == PROCESSOR_NULL || processor->processor_set == PROCESSOR_SET_NULL)
 433                 return (KERN_INVALID_ARGUMENT);
 434
 435         if (processor == master_processor) {
 436                 processor_t             prev;
 437
 438                 prev = thread_bind(processor);
 439                 thread_block(THREAD_CONTINUE_NULL);
 440
 441                 result = cpu_start(processor->cpu_id);
 442
 443                 thread_bind(prev);
 444
 445                 return (result);
 446         }
 447
 448         s = splsched();
 449         pset = processor->processor_set;
 450         pset_lock(pset);
 451         if (processor->state != PROCESSOR_OFF_LINE) {
 452                 pset_unlock(pset);
 453                 splx(s);
 454
 455                 return (KERN_FAILURE);
 456         }
 457
 458         processor->state = PROCESSOR_START;
 459         pset_unlock(pset);
 460         splx(s);
 461
 462         /*
 463          *      Create the idle processor thread.
 464          */
 465         if (processor->idle_thread == THREAD_NULL) {
 466                 result = idle_thread_create(processor);
 467                 if (result != KERN_SUCCESS) {
 468                         s = splsched();
 469                         pset_lock(pset);
 470                         processor->state = PROCESSOR_OFF_LINE;
 471                         pset_unlock(pset);
 472                         splx(s);
 473
 474                         return (result);
 475                 }
 476         }
 477
 478         /*
 479          *      If there is no active thread, the processor
 480          *      has never been started.  Create a dedicated
 481          *      start up thread.
 482          */
 483         if (    processor->active_thread == THREAD_NULL         &&
 484                         processor->next_thread == THREAD_NULL           ) {
 485                 result = kernel_thread_create((thread_continue_t)processor_start_thread, NULL, MAXPRI_KERNEL, &thread);
 486                 if (result != KERN_SUCCESS) {
 487                         s = splsched();
 488                         pset_lock(pset);
 489                         processor->state = PROCESSOR_OFF_LINE;
 490                         pset_unlock(pset);
 491                         splx(s);
 492
 493                         return (result);
 494                 }
 495
 496                 s = splsched();
 497                 thread_lock(thread);
 498                 thread->bound_processor = processor;
 499                 processor->next_thread = thread;
 500                 thread->state = TH_RUN;
 501                 thread_unlock(thread);
 502                 splx(s);
 503
 504                 thread_deallocate(thread);
 505         }
 506
 507         if (processor->processor_self == IP_NULL)
 508                 ipc_processor_init(processor);
 509
 510         result = cpu_start(processor->cpu_id);
 511         if (result != KERN_SUCCESS) {
 512                 s = splsched();
 513                 pset_lock(pset);
 514                 processor->state = PROCESSOR_OFF_LINE;
 515                 pset_unlock(pset);
 516                 splx(s);
 517
 518                 return (result);
 519         }
 520
 521         ipc_processor_enable(processor);
 522
 523         return (KERN_SUCCESS);
 524 }
 525
 526 kern_return_t
 527 processor_exit(
 528         processor_t     processor)
 529 {
 530         if (processor == PROCESSOR_NULL)
 531                 return(KERN_INVALID_ARGUMENT);
 532
 533         return(processor_shutdown(processor));
 534 }
 535
 536 kern_return_t
 537 processor_control(
 538         processor_t             processor,
 539         processor_info_t        info,
 540         mach_msg_type_number_t  count)
 541 {
 542         if (processor == PROCESSOR_NULL)
 543                 return(KERN_INVALID_ARGUMENT);
 544
 545         return(cpu_control(processor->cpu_id, info, count));
 546 }
 547
 548 kern_return_t
 549 processor_set_create(
 550         __unused host_t         host,
 551         __unused processor_set_t        *new_set,
 552         __unused processor_set_t        *new_name)
 553 {
 554         return(KERN_FAILURE);
 555 }
 556
 557 kern_return_t
 558 processor_set_destroy(
 559         __unused processor_set_t        pset)
 560 {
 561         return(KERN_FAILURE);
 562 }
 563
 564 kern_return_t
 565 processor_get_assignment(
 566         processor_t     processor,
 567         processor_set_t *pset)
 568 {
 569         int state;
 570
 571         if (processor == PROCESSOR_NULL)
 572                 return(KERN_INVALID_ARGUMENT);
 573
 574         state = processor->state;
 575         if (state == PROCESSOR_SHUTDOWN || state == PROCESSOR_OFF_LINE)
 576                 return(KERN_FAILURE);
 577
 578         *pset = &pset0;
 579
 580         return(KERN_SUCCESS);
 581 }
 582
 583 kern_return_t
 584 processor_set_info(
 585         processor_set_t         pset,
 586         int                     flavor,
 587         host_t                  *host,
 588         processor_set_info_t    info,
 589         mach_msg_type_number_t  *count)
 590 {
 591         if (pset == PROCESSOR_SET_NULL)
 592                 return(KERN_INVALID_ARGUMENT);
 593
 594         if (flavor == PROCESSOR_SET_BASIC_INFO) {
 595                 register processor_set_basic_info_t     basic_info;
 596
 597                 if (*count < PROCESSOR_SET_BASIC_INFO_COUNT)
 598                         return(KERN_FAILURE);
 599
 600                 basic_info = (processor_set_basic_info_t) info;
 601                 basic_info->processor_count = processor_avail_count;
 602                 basic_info->default_policy = POLICY_TIMESHARE;
 603
 604                 *count = PROCESSOR_SET_BASIC_INFO_COUNT;
 605                 *host = &realhost;
 606                 return(KERN_SUCCESS);
 607         }
 608         else if (flavor == PROCESSOR_SET_TIMESHARE_DEFAULT) {
 609                 register policy_timeshare_base_t        ts_base;
 610
 611                 if (*count < POLICY_TIMESHARE_BASE_COUNT)
 612                         return(KERN_FAILURE);
 613
 614                 ts_base = (policy_timeshare_base_t) info;
 615                 ts_base->base_priority = BASEPRI_DEFAULT;
 616
 617                 *count = POLICY_TIMESHARE_BASE_COUNT;
 618                 *host = &realhost;
 619                 return(KERN_SUCCESS);
 620         }
 621         else if (flavor == PROCESSOR_SET_FIFO_DEFAULT) {
 622                 register policy_fifo_base_t             fifo_base;
 623
 624                 if (*count < POLICY_FIFO_BASE_COUNT)
 625                         return(KERN_FAILURE);
 626
 627                 fifo_base = (policy_fifo_base_t) info;
 628                 fifo_base->base_priority = BASEPRI_DEFAULT;
 629
 630                 *count = POLICY_FIFO_BASE_COUNT;
 631                 *host = &realhost;
 632                 return(KERN_SUCCESS);
 633         }
 634         else if (flavor == PROCESSOR_SET_RR_DEFAULT) {
 635                 register policy_rr_base_t               rr_base;
 636
 637                 if (*count < POLICY_RR_BASE_COUNT)
 638                         return(KERN_FAILURE);
 639
 640                 rr_base = (policy_rr_base_t) info;
 641                 rr_base->base_priority = BASEPRI_DEFAULT;
 642                 rr_base->quantum = 1;
 643
 644                 *count = POLICY_RR_BASE_COUNT;
 645                 *host = &realhost;
 646                 return(KERN_SUCCESS);
 647         }
 648         else if (flavor == PROCESSOR_SET_TIMESHARE_LIMITS) {
 649                 register policy_timeshare_limit_t       ts_limit;
 650
 651                 if (*count < POLICY_TIMESHARE_LIMIT_COUNT)
 652                         return(KERN_FAILURE);
 653
 654                 ts_limit = (policy_timeshare_limit_t) info;
 655                 ts_limit->max_priority = MAXPRI_KERNEL;
 656
 657                 *count = POLICY_TIMESHARE_LIMIT_COUNT;
 658                 *host = &realhost;
 659                 return(KERN_SUCCESS);
 660         }
 661         else if (flavor == PROCESSOR_SET_FIFO_LIMITS) {
 662                 register policy_fifo_limit_t            fifo_limit;
 663
 664                 if (*count < POLICY_FIFO_LIMIT_COUNT)
 665                         return(KERN_FAILURE);
 666
 667                 fifo_limit = (policy_fifo_limit_t) info;
 668                 fifo_limit->max_priority = MAXPRI_KERNEL;
 669
 670                 *count = POLICY_FIFO_LIMIT_COUNT;
 671                 *host = &realhost;
 672                 return(KERN_SUCCESS);
 673         }
 674         else if (flavor == PROCESSOR_SET_RR_LIMITS) {
 675                 register policy_rr_limit_t              rr_limit;
 676
 677                 if (*count < POLICY_RR_LIMIT_COUNT)
 678                         return(KERN_FAILURE);
 679
 680                 rr_limit = (policy_rr_limit_t) info;
 681                 rr_limit->max_priority = MAXPRI_KERNEL;
 682
 683                 *count = POLICY_RR_LIMIT_COUNT;
 684                 *host = &realhost;
 685                 return(KERN_SUCCESS);
 686         }
 687         else if (flavor == PROCESSOR_SET_ENABLED_POLICIES) {
 688                 register int                            *enabled;
 689
 690                 if (*count < (sizeof(*enabled)/sizeof(int)))
 691                         return(KERN_FAILURE);
 692
 693                 enabled = (int *) info;
 694                 *enabled = POLICY_TIMESHARE | POLICY_RR | POLICY_FIFO;
 695
 696                 *count = sizeof(*enabled)/sizeof(int);
 697                 *host = &realhost;
 698                 return(KERN_SUCCESS);
 699         }
 700
 701
 702         *host = HOST_NULL;
 703         return(KERN_INVALID_ARGUMENT);
 704 }
 705
 706 /*
 707  *      processor_set_statistics
 708  *
 709  *      Returns scheduling statistics for a processor set.
 710  */
 711 kern_return_t
 712 processor_set_statistics(
 713         processor_set_t         pset,
 714         int                     flavor,
 715         processor_set_info_t    info,
 716         mach_msg_type_number_t  *count)
 717 {
 718         if (pset == PROCESSOR_SET_NULL || pset != &pset0)
 719                 return (KERN_INVALID_PROCESSOR_SET);
 720
 721         if (flavor == PROCESSOR_SET_LOAD_INFO) {
 722                 register processor_set_load_info_t     load_info;
 723
 724                 if (*count < PROCESSOR_SET_LOAD_INFO_COUNT)
 725                         return(KERN_FAILURE);
 726
 727                 load_info = (processor_set_load_info_t) info;
 728
 729                 load_info->mach_factor = sched_mach_factor;
 730                 load_info->load_average = sched_load_average;
 731
 732                 load_info->task_count = tasks_count;
 733                 load_info->thread_count = threads_count;
 734
 735                 *count = PROCESSOR_SET_LOAD_INFO_COUNT;
 736                 return(KERN_SUCCESS);
 737         }
 738
 739         return(KERN_INVALID_ARGUMENT);
 740 }
 741
 742 /*
 743  *      processor_set_max_priority:
 744  *
 745  *      Specify max priority permitted on processor set.  This affects
 746  *      newly created and assigned threads.  Optionally change existing
 747  *      ones.
 748  */
 749 kern_return_t
 750 processor_set_max_priority(
 751         __unused processor_set_t        pset,
 752         __unused int                    max_priority,
 753         __unused boolean_t              change_threads)
 754 {
 755         return (KERN_INVALID_ARGUMENT);
 756 }
 757
 758 /*
 759  *      processor_set_policy_enable:
 760  *
 761  *      Allow indicated policy on processor set.
 762  */
 763
 764 kern_return_t
 765 processor_set_policy_enable(
 766         __unused processor_set_t        pset,
 767         __unused int                    policy)
 768 {
 769         return (KERN_INVALID_ARGUMENT);
 770 }
 771
 772 /*
 773  *      processor_set_policy_disable:
 774  *
 775  *      Forbid indicated policy on processor set.  Time sharing cannot
 776  *      be forbidden.
 777  */
 778 kern_return_t
 779 processor_set_policy_disable(
 780         __unused processor_set_t        pset,
 781         __unused int                    policy,
 782         __unused boolean_t              change_threads)
 783 {
 784         return (KERN_INVALID_ARGUMENT);
 785 }
 786
 787 #define THING_TASK      0
 788 #define THING_THREAD    1
 789
 790 /*
 791  *      processor_set_things:
 792  *
 793  *      Common internals for processor_set_{threads,tasks}
 794  */
 795 kern_return_t
 796 processor_set_things(
 797         processor_set_t                 pset,
 798         mach_port_t                             **thing_list,
 799         mach_msg_type_number_t  *count,
 800         int                                             type)
 801 {
 802         unsigned int actual;    /* this many things */
 803         unsigned int maxthings;
 804         unsigned int i;
 805
 806         vm_size_t size, size_needed;
 807         void  *addr;
 808
 809         if (pset == PROCESSOR_SET_NULL || pset != &pset0)
 810                 return (KERN_INVALID_ARGUMENT);
 811
 812         size = 0;
 813         addr = NULL;
 814
 815         for (;;) {
 816                 lck_mtx_lock(&tasks_threads_lock);
 817
 818                 if (type == THING_TASK)
 819                         maxthings = tasks_count;
 820                 else
 821                         maxthings = threads_count;
 822
 823                 /* do we have the memory we need? */
 824
 825                 size_needed = maxthings * sizeof (mach_port_t);
 826                 if (size_needed <= size)
 827                         break;
 828
 829                 /* unlock and allocate more memory */
 830                 lck_mtx_unlock(&tasks_threads_lock);
 831
 832                 if (size != 0)
 833                         kfree(addr, size);
 834
 835                 assert(size_needed > 0);
 836                 size = size_needed;
 837
 838                 addr = kalloc(size);
 839                 if (addr == 0)
 840                         return (KERN_RESOURCE_SHORTAGE);
 841         }
 842
 843         /* OK, have memory and the list locked */
 844
 845         actual = 0;
 846         switch (type) {
 847
 848         case THING_TASK: {
 849                 task_t          task, *task_list = (task_t *)addr;
 850
 851                 for (task = (task_t)queue_first(&tasks);
 852                                                 !queue_end(&tasks, (queue_entry_t)task);
 853                                                                 task = (task_t)queue_next(&task->tasks)) {
 854 #if defined(SECURE_KERNEL)
 855                         if (task != kernel_task) {
 856 #endif
 857                                 task_reference_internal(task);
 858                                 task_list[actual++] = task;
 859 #if defined(SECURE_KERNEL)
 860                         }
 861 #endif
 862                 }
 863
 864                 break;
 865         }
 866
 867         case THING_THREAD: {
 868                 thread_t        thread, *thread_list = (thread_t *)addr;
 869
 870                 for (thread = (thread_t)queue_first(&threads);
 871                                                 !queue_end(&threads, (queue_entry_t)thread);
 872                                                                 thread = (thread_t)queue_next(&thread->threads)) {
 873                         thread_reference_internal(thread);
 874                         thread_list[actual++] = thread;
 875                 }
 876
 877                 break;
 878         }
 879
 880         }
 881
 882         lck_mtx_unlock(&tasks_threads_lock);
 883
 884         if (actual < maxthings)
 885                 size_needed = actual * sizeof (mach_port_t);
 886
 887         if (actual == 0) {
 888                 /* no things, so return null pointer and deallocate memory */
 889                 *thing_list = NULL;
 890                 *count = 0;
 891
 892                 if (size != 0)
 893                         kfree(addr, size);
 894         }
 895         else {
 896                 /* if we allocated too much, must copy */
 897
 898                 if (size_needed < size) {
 899                         void *newaddr;
 900
 901                         newaddr = kalloc(size_needed);
 902                         if (newaddr == 0) {
 903                                 switch (type) {
 904
 905                                 case THING_TASK: {
 906                                         task_t          *task_list = (task_t *)addr;
 907
 908                                         for (i = 0; i < actual; i++)
 909                                                 task_deallocate(task_list[i]);
 910                                         break;
 911                                 }
 912
 913                                 case THING_THREAD: {
 914                                         thread_t        *thread_list = (thread_t *)addr;
 915
 916                                         for (i = 0; i < actual; i++)
 917                                                 thread_deallocate(thread_list[i]);
 918                                         break;
 919                                 }
 920
 921                                 }
 922
 923                                 kfree(addr, size);
 924                                 return (KERN_RESOURCE_SHORTAGE);
 925                         }
 926
 927                         bcopy((void *) addr, (void *) newaddr, size_needed);
 928                         kfree(addr, size);
 929                         addr = newaddr;
 930                 }
 931
 932                 *thing_list = (mach_port_t *)addr;
 933                 *count = actual;
 934
 935                 /* do the conversion that Mig should handle */
 936
 937                 switch (type) {
 938
 939                 case THING_TASK: {
 940                         task_t          *task_list = (task_t *)addr;
 941
 942                         for (i = 0; i < actual; i++)
 943                                 (*thing_list)[i] = convert_task_to_port(task_list[i]);
 944                         break;
 945                 }
 946
 947                 case THING_THREAD: {
 948                         thread_t        *thread_list = (thread_t *)addr;
 949
 950                         for (i = 0; i < actual; i++)
 951                                 (*thing_list)[i] = convert_thread_to_port(thread_list[i]);
 952                         break;
 953                 }
 954
 955                 }
 956         }
 957
 958         return (KERN_SUCCESS);
 959 }
 960
 961
 962 /*
 963  *      processor_set_tasks:
 964  *
 965  *      List all tasks in the processor set.
 966  */
 967 kern_return_t
 968 processor_set_tasks(
 969         processor_set_t         pset,
 970         task_array_t            *task_list,
 971         mach_msg_type_number_t  *count)
 972 {
 973     return(processor_set_things(pset, (mach_port_t **)task_list, count, THING_TASK));
 974 }
 975
 976 /*
 977  *      processor_set_threads:
 978  *
 979  *      List all threads in the processor set.
 980  */
 981 #if defined(SECURE_KERNEL)
 982 kern_return_t
 983 processor_set_threads(
 984         __unused processor_set_t                pset,
 985         __unused thread_array_t         *thread_list,
 986         __unused mach_msg_type_number_t *count)
 987 {
 988     return KERN_FAILURE;
 989 }
 990 #else
 991 kern_return_t
 992 processor_set_threads(
 993         processor_set_t         pset,
 994         thread_array_t          *thread_list,
 995         mach_msg_type_number_t  *count)
 996 {
 997     return(processor_set_things(pset, (mach_port_t **)thread_list, count, THING_THREAD));
 998 }
 999 #endif
1000
1001 /*
1002  *      processor_set_policy_control
1003  *
1004  *      Controls the scheduling attributes governing the processor set.
1005  *      Allows control of enabled policies, and per-policy base and limit
1006  *      priorities.
1007  */
1008 kern_return_t
1009 processor_set_policy_control(
1010         __unused processor_set_t                pset,
1011         __unused int                            flavor,
1012         __unused processor_set_info_t   policy_info,
1013         __unused mach_msg_type_number_t count,
1014         __unused boolean_t                      change)
1015 {
1016         return (KERN_INVALID_ARGUMENT);
1017 }
1018
1019 #undef pset_deallocate
1020 void pset_deallocate(processor_set_t pset);
1021 void
1022 pset_deallocate(
1023 __unused processor_set_t        pset)
1024 {
1025         return;
1026 }
1027
1028 #undef pset_reference
1029 void pset_reference(processor_set_t pset);
1030 void
1031 pset_reference(
1032 __unused processor_set_t        pset)
1033 {
1034         return;
1035 }